Make sure that the pool you are visiting allows photography. Take lots of pictures and then select the best. Take dry pics first. This can be so teasing, knowing that you are going to get wet. Then, if you can, get in bit by bit. Dry-to-wet gradually can be great too! Have fun and have a great day. Peter
Possibly a bit late but the absolute most important thing in outdoor wetlook photography, which an incredible number of people get wrong, is:
Make sure the sun is behind the photographer.
Closely followed by:
Check where any shadows are, avoid having the model half in shadow.
Way too many people take wetlook photos where either, a) in a pool there's a massive shadow from a building or a large tree falling across the shoot zone, and they have the model half-in and half out of the shadow, or b) have the sun behind the model, so they are shooting into the light and all you see in the pics is a shilouette.
Our eyes are good at seeing detail regardless of wildly varying light levels across a scene. But cameras are not. So if you shoot without the light being behind the photographer, or with the model half in and half out of shadow, most, or all, of the actual detail of the difference between the wet and dry parts of their clothes will be lost.